4 Sets of:

1min Plank
25sec Side Plank (R)
25sec Side Plank (L)
15 GHD Back Extensions
25 Russian Twists

*Rest 1min between sets  

LADDER for 12′:

2 Pull-ups
2 Deadlifts (60/40kg)
4 Pull-ups
4 Deadlifts (60/40kg)
…etc